Arrangement for reducing the field strength on an electrode

ABSTRACT

An arrangement for reducing the electric field strength on the face of an electrode, wherein the face of the electrode is surrounded by at least one electric barrier, and a shielding electrode having a defined voltage potential is disposed in the vicinity of the face of the electrode. By using a retaining element that can be connected directly to the face of the electrode, the shielding wires can be quickly and easily positioned and fixed relative to the face of the electrode and the shielding electrode relative to the face.

BACKGROUND OF THE INVENTION Field of the Invention

The invention relates to an arrangement for reducing the electric fieldstrength on an end face of an electrode, wherein the end face of theelectrode is surrounded by at least one electrical barrier and ashielding electrode having a defined electrical voltage potential isarranged in the vicinity of the end electrode.

For shielding from high electric field strengths, at narrow electricaledges on account of the high electric field strengths use is made ofso-called shielding wires for reducing the electric field strength.These shielding wires usually arranged singly or doubly reduce the fieldstrength on an in particular narrow electrode. For this purpose, theshielding wire is usually connected to an electrically effective barrierthat runs parallel to the shield and likewise serves for fixing theexact position of the shielding wire relative to the electrode.

What is disadvantageous in this case is that high field strengths cannevertheless arise and a connection element between the barrier and theshielding wire is necessary, in which case the connection must be anelectrical insulator.

BRIEF SUMMARY OF THE INVENTION

It is an object of the present invention, therefore, to provide apossibility of enabling the shielding electrode to be positioned simplyand rapidly relative to the electrode. The object is achieved by meansof the features of the independent claims. The invention provides for aholding element to be fitted to the electrode and for the shieldingelectrode to be positioned and fixed relative to the electrode by theholding element. The use of a holding element that is in mechanicalcontact directly with the electrode enables a substantially simple andfaster positioning of the shielding electrode relative to the end faceof the electrode. Advantageously, the holding element is mechanicallyconnected directly to the electrode. Advantageously, the holding elementis mechanically connected directly to the electrode.

One advantageous configuration of the invention provides for the holdingelement to be suitable for receiving a plurality of shieldingelectrodes. In particular by means of predetermined cutouts within theholding element or by means of corresponding shapings in the form ofdepressions on the outer side of the holding element, a simplepositioning of the shielding electrodes relative to one another andrelative to the electrode is possible by means of the holding element.

Advantageously, the holding element is arranged between the electrodeand the barrier. Furthermore, it is advantageously provided that thebarrier can be fixed to the holding element. The measure ensures thatthe barrier and the shielding electrodes can be positioned rapidly andsimply relative to the end face of the electrode. In order to avoidelectrical flashovers and short circuits, the holding element is atleast partly produced from an electrical insulation material, inparticular a pressboard.

It is advantageously provided that the barrier and/or the shieldingelectrodes can be inserted into the holding element. By means of thismodular construction, the individual segments such as the holdingelement, the barrier and the shielding electrodes can be producedseparately and be inserted one into another by means of a correspondingplug-in mechanism system and thus be positioned relative to one another.As an alternative, it is provided that the barrier and the shieldingelectrode are fixedly connected to the holding element, such that herethe entire unit comprising holding element, shielding electrodes andbarriers can be placed as a whole onto the end face of the electrode.

The shielding electrode advantageously has a round or a polygonal crosssection, wherein the holding element has a cutout accordinglycorresponding to the cross section of the shielding electrode.Furthermore, in order to effectively reduce the field strengths on theend face of the electrode, the shielding electrodes can be arrangedsymmetrically or asymmetrically relative to the end face of theelectrode.

The object is likewise achieved by means of a holding element forretaining a shielding electrode relative to an end face of an electrode,wherein according to the invention it is provided that the holdingelement can be connected to the electrode and the shielding electrodecan thus be positioned and fixed relative to the end face of theelectrode.

Advantageously, the shielding electrode can be inserted into the holdingelement with respect to predeterminable positions. As a result of this,the relative position of the shielding electrodes with respect to oneanother or relative to the end face of the electrode can already bedefined during the production process. Furthermore, the holding elementis advantageously composed of an electrical insulation material.

Further advantageous configurations of the invention are described inthe dependent claims. The invention is explained in more detail withreference to the following drawings, in which:

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 shows the prior art with regard to previous arrangements forreducing the electric field strength on the end face of an electrode;

FIG. 2 shows an arrangement according to the invention with threeshielding electrode arranged asymmetrically with respect to the end faceof an electrode.

FIG. 3 shows an arrangement according to the invention with a modularconstruction of the holding element for three shielding electrodesarranged asymmetrically with respect to the end face of an electrode.

DESCRIPTION OF THE INVENTION

FIG. 1 shows, as a sectional drawing, the prior art for an arrangementfor reducing the field strength on the end face of an electrode 1 with adoubly embodied shielding wire 3, wherein the shielding wire 3 is fixedabove the end face of the electrode 1 on the barriers 4.

In contrast thereto, FIG. 2 shows, as a sectional drawing, a holdingelement 2 according to the invention, wherein, relative to the end faceof the electrode 1, three shielding electrodes 3 are connected to theholding element 2. Furthermore, the holding element 2 serves forretaining the barriers 4, wherein the barrier 4 is now no longer onlyarranged exclusively on the end face of the electrode 1, but rather canalso be arranged along the longitudinal side of the electrode 1. This ispossible since the holding element 2 on the end face of the electrode 1ensures sufficient mechanical stability for a corresponding barrierconstruction along, at least the upper part of, the electrode 1.

FIG. 3 shows an arrangement according to the invention with a modularconstruction of the holding element 2 for three shielding electrodes 3arranged asymmetrically with respect to the end face of an electrode 1,as a sectional drawing. The holding element 2 in accordance with FIG. 3comprises three partial elements 5 a to 5 c, which can be modularlyconnected to one another by means of suitable fixing elements such as,for example, screws or adhesives. By means of the modular constructionof the holding element 2, not only is it possible for the shieldingwires 3 to be connected to the holding element 2 more easily, but it ispossible for the partial elements 5 a to 5 c to be produced separatelyand not to be assembled until at the installation location of thearrangement.

In accordance with the exemplary embodiment in FIG. 3, the holdingelement 2 comprises two partial elements 5 b and 5 c embodied asinsulation bodies and one tubular partial element 5 a as part of anouter wall 6 around the electrode 1. The partial elements 5 b and 5 ccan either be connected by means of suitable fixing elements, forexample by means of screws, or can be plugged together and thusconnected to one another by means of suitable surface shapings, forexample a tongue-and-groove joint. The same applies to the furthertubular partial element 5 a shown in the sectional drawing in FIG. 3,which can be connected to the rest of the partial elements 5 b and 5 cby means of suitable fixing elements and thus forms the holding element2.

The invention claimed is:
 1. An arrangement for reducing the electricfield strength on an end face of an electrode, which comprises: at leastone electrical barrier surrounding the end face of the electrode; ashielding electrode having a defined electrical voltage potentialdisposed in a vicinity of the end face of the electrode; and a holdingelement fitted to the electrode, said holding element positioning andfixing said shielding electrode relative to the electrode, said holdingelement formed of a pressboard; wherein said electrical barrier isfixable to said holding element.
 2. The arrangement according to claim1, wherein said holding element is configured to receive at least twoshielding electrodes.
 3. The arrangement according to claim 1, whereinsaid holding element is disposed between the electrode and saidelectrical barrier.
 4. The arrangement according to claim 1, whereinsaid electrical barrier is fixed to said holding element.
 5. Thearrangement according to claim 1, wherein said shielding electrode iselectrically connected to the electrode.
 6. The arrangement according toclaim 1, wherein at least one of said electrical barrier and saidshielding electrode is insertible into said holding element.
 7. Thearrangement according to claim 1, wherein at least one of saidelectrical barrier and said shielding electrode is fixedly connected tosaid holding element.
 8. The arrangement according to claim 1, whereinsaid shielding electrode has a round or polygonal cross section.
 9. Thearrangement according to claim 1, wherein said shielding electrode isone of at least two shielding electrodes arranged symmetrically relativeto the end face of the electrode.
 10. The arrangement according to claim1, wherein said shielding electrode is one of at least two shieldingelectrodes arranged asymmetrically relative to the end face of theelectrode.
 11. A holding element for retaining a shielding electroderelative to an end face of an electrode, comprising: the holding elementbeing configured for connection to the electrode and for positioning andfixing the shielding electrode relative to the end face of theelectrode; the holding element formed of a pressboard; the holdingelement being composed of and assembled from partial elements; andfixing elements for connecting said partial elements to one another. 12.The holding element according to claim 11, wherein the holding elementis configured to enable the shielding electrode to be inserted thereintowith respect to predeterminable positions.
 13. The holding elementaccording to claim 11, wherein the holding element comprises anelectrical insulation material.